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Does your rifle have a USGI op rod? If not it has a rare Chinese op rod with the notch for the full auto feature and not the made for the US model with the rear slant cut op rod.

 

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you know ive wondered but I never found a maker stamp on it but i wasnt sure if it was original to the rifle or not

If not marked, then its Chinese. The gray finish will match the other parts of the rifle. Plus it will look right with the fake full auto kit.